Family: Chloroplasts plate-like or ribbon-like; sexual reproduction by isogamy.
Genus: Without gelatinous sheath; filaments consist of many cells; rhizoid formed at one end (Illustrations of The Japanese Fresh-water Algae, 1977).
cell body μm long, μm wide,
x 640, Kanayama green park, Kiyose city, Tokyo, Japan, August 2001 by Y. Tsukii
31 μm 63 μm 94 μm; x 640